meson: Add -Wno-classmemacces to the compiler
meson: Add -Wno-classmemacces to the compiler

Build fails with gcc 8 otherwise and the only place where it happens has
been explicitely marked as safe in encode_ext.cpp:

    memcpy (pCtx->pSvcParam, pCodingParam, sizeof (SWelsSvcCodingParam)); // confirmed_safe_unsafe_usage"

shihuade/openh264,shihuade/openh264,shihuade/openh264,cisco/openh264,cisco/openh264,ruil2/openh264,cisco/openh264,mstorsjo/openh264,cisco/openh264,ruil2/openh264,shihuade/openh264,ruil2/openh264,mstorsjo/openh264,shihuade/openh264,GuangweiWang/openh264,shihuade/openh264,GuangweiWang/openh264,GuangweiWang/openh264,cisco/openh264,ruil2/openh264,ruil2/openh264,mstorsjo/openh264,GuangweiWang/openh264,cisco/openh264,ruil2/openh264,mstorsjo/openh264,GuangweiWang/openh264,ruil2/openh264,GuangweiWang/openh264,mstorsjo/openh264,mstorsjo/openh264,shihuade/openh264,cisco/openh264,mstorsjo/openh264,GuangweiWang/openh264